EP2104859B1 - Mehrphasen-strommessgerät - Google Patents

Mehrphasen-strommessgerät Download PDF

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Publication number
EP2104859B1
EP2104859B1 EP08701267A EP08701267A EP2104859B1 EP 2104859 B1 EP2104859 B1 EP 2104859B1 EP 08701267 A EP08701267 A EP 08701267A EP 08701267 A EP08701267 A EP 08701267A EP 2104859 B1 EP2104859 B1 EP 2104859B1
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EP
European Patent Office
Prior art keywords
input
current
voltage
analog
meter
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Application number
EP08701267A
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English (en)
French (fr)
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EP2104859A2 (de
Inventor
Volker Rzehak
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Texas Instruments Deutschland GmbH
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Texas Instruments Deutschland GmbH
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique

Definitions

  • the invention relates to a polyphase electric energy meter.
  • current input signals are derived from the three phases with current transformers and voltage input signals are derived from the three phases with a resistive voltage divider.
  • the current and voltage input signals are sampled and the current samples are multiplied with the voltage samples to obtain electric energy samples which are cumulated to provide an indication representative of consumed electric energy.
  • An alternative approach is to use a single high resolution ADC with an input multiplexer and an output de-multiplexer.
  • this "sequential" approach the current and voltage input signals are sequentially switched to the input of the ADC and the resulting digital samples are corrected in phase to compensate for the delays introduced by the sequential sampling.
  • the sequential approach needs less die space, but requires a complex analog-to-digital converter to combine the high resolution requirements with the need to multiplex through all current and voltage signals.
  • the document US 2003/036864 A1 discloses a polyphase electric energy meter comprising a microcontroller converting analog input signals to digital samples and including common input channels for all the voltage or all the current signals, with a respective multiplexer and a respective A/D converter providing said signals to be processed by the microcontroller.
  • the invention provides a polyphase electric energy meter comprising a microcontroller with a front end that offers high resolution at moderate die space requirements.
  • the polyphase electric energy meter of the invention comprises a microcontroller with a front end that converts analog current input signals and analog voltage input signals to digital current and voltage samples for processing by the microcontroller.
  • the front end includes separate input channels, each for one of the current input signals with a high resolution analog-to-digital converter, preferably a sigma-delta modulator followed by a decimation filter.
  • the front end further includes a common input channel for all voltage input signals with a multiplexer, an analog-to-digital converter and a demultiplexer. The separate input channels and the common input channel provide the digital current and voltage samples for processing by the microcontroller.
  • the invention is based on the understanding that only the current input signals, due to their possibly high dynamic range, need an analog-to-digital conversion at a high resolution and that the voltage input signals with their small dynamic range can be sampled sequentially at a moderate resolution. Thus, for a three-phase meter, only three high resolution are needed ADCs for the three current input signals and a single ADC of a moderate resolution for the voltage input signals.
  • the multiplexer has one input for each voltage input signal and at least one additional input for an auxiliary input signal such as a temperature signal or a battery voltage signal. Since the voltage samples are taken at a moderate rate, the multiplexer can be implemented with additional time slots so that more than just the voltage input signals can be processed in the single common input channel.
  • the front end comprises three of the separate input channels, each for one of three current phases, and an additional separate input channel for the neutral current input signal.
  • the multiplexed ADC can be used if a reduction of accuracy for the conversion of the neutral current is acceptable.
  • the microcontroller 10 generally shown in FIG. 1 includes a front-end 12 which has a plurality of analog inputs and a plurality of digital outputs.
  • the analog inputs are adapted to receive external analog input signals and the digital outputs are internal to the microcontroller for further processing therein.
  • the front-end 12 includes three parallel input channels, each with a fully differential programmable gain amplifier PGA and a sigma-delta modulator followed by a decimation low-pass filter.
  • the differential inputs of the amplifier PGA receive analog current input signals I A , I B and I C , respectively, and the decimation filters provide corresponding digital current output samples I AD , I BD and I CD , respectively.
  • the front-end 12 further includes a multiplexer MUX with four analog inputs receiving voltage input signals V A , V B , V C and V N , respectively, and a number of further optional inputs for application of auxiliary external or internal signals.
  • the output of multiplexer MUX is connected to the input of an analog-to-digital converter ADC, the digital output of which is connected to a de-multiplexer De-MUX.
  • the de-multiplexer De-MUX provides digital voltage samples V AD , V BD , V CD , and V ND , respectively, and one or more optional parameter samples P.
  • a block "Synchronization" in the front-end 12 synchronizes operation of all sigma-delta modulators, of the multiplexer MUX and de-multiplexer De-MUX, and of the ADC.
  • the electric energy meter is connected to the three phases A, B and C of a three-phase power source 14 which feeds a three-phase load 16.
  • each phase has an associated current transformer CT A , CT B and CT C , respectively, and a resistive voltage divider VD A , VD B and VD C , respectively.
  • the current transformers CT A , CT B and CT C generate the current input signals I A , I B and I C
  • the voltage dividers VD A , VD B and VD C provide the voltage input signals V A , V B , V C .
  • the neutral voltage signal V N is applied directly to a corresponding input of the multiplexer MUX.
  • Optional input signals such as external parameters (temperature, battery voltage, etc.) or internal analog signals are applied to further inputs of multiplexer MUX.
  • the analog current and voltage input signals are converted to digital samples for further processing by the microcontroller.
  • the current input signals are analog-to-digital converted at a high resolution (e.g., at least 16-bit resolution) in parallel and synchronously by the three separate input channels, each with a programmable gain amplifier and a sigma-delta modulator followed by a decimation filter.
  • a high resolution e.g., at least 16-bit resolution
  • the voltage input signals are sequentially applied to the ADC, which may have a moderate resolution of, e.g., 12 bits, and corresponding digital voltage samples V AD , V BD and V CD are available at the outputs of the de-multiplexer De-MUX.
  • the digital current and voltage samples at the output of the front-end 12 are further processed by the microcontroller by means of software which accounts for the delays of the multiplexed voltage samples.
  • an additional input channel is included with an associated further current transformer placed in the neutral line.
  • This additional input channel may be similar to the three separate input channels and include a programmable gain amplifier followed by a sigma-delta modulator and a low-pass decimation filter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Analogue/Digital Conversion (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Measuring Phase Differences (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Inorganic Insulating Materials (AREA)

Claims (7)

  1. Mehrphasenzähler zur Messung elektrischer Energie, umfassend:
    einen Mikrocontroller mit einer Eingangsstufe, welche analoge Stromeingangssignale und analoge Spannungseingangssignale in digitale Strom- und Spannungswerte zur Verarbeitung durch den Mikrocontroller umwandelt, die Eingangsstufe umfassend:
    separate Eingangskanäle für jedes der Stromeingangssignale, welche einen hochauflösenden Analog-Digital-Wandler aufweisen, und
    einen gemeinsamen Eingangskanal für alle Spannungseingangssignale mit einem Multiplexer, einem Analog-Digital-Wandler und einem Demultiplexer,
    wobei die separaten Eingangskanäle und der gemeinsame Eingangskanal die digitalen Strom- und Spannungswerte dem Mikrocontroller zur Verarbeitung zur Verfügung stellen.
  2. Mehrphasenzähler nach Anspruch 1, wobei der in jedem der separaten Eingangskanäle vorhandene hochauflösende Analog-Digital-Wandler ein Sigma-Delta-Modulator gefolgt von einem Dezimationsfilter ist.
  3. Mehrphasenzähler nach Anspruch 2, wobei der Multiplexer jeweils einen Eingang für jedes der Spannungseingangssignale und zumindest einen weiteren Eingang für ein Hilfseingangssignal aufweist.
  4. Mehrphasenzähler nach Anspruch 3, wobei die Eingangsstufe die drei separaten Eingangskanäle für jeweils eine der drei Stromphasen und einen zusätzlichen separaten Eingangskanal für ein Neutralleiterstrom-Eingangssignal umfasst.
  5. Mehrphasenzähler nach Anspruch 2, wobei die Eingangsstufe die drei separaten Eingangskanäle für jeweils eine der drei Stromphasen und einen zusätzlichen separaten Eingangskanal für ein Neutralleiterstrom-Eingangssignal umfasst.
  6. Mehrphasenzähler nach Anspruch 1, wobei der Multiplexer jeweils einen Eingang für jedes der Spannungseingangssignale und zumindest einen weiteren Eingang für ein Hilfseingangssignal aufweist.
  7. Mehrphasenzähler nach Anspruch 1, wobei die Eingangsstufe die drei separaten Eingangskanäle für jeweils eine der drei Stromphasen und einen zusätzlichen separaten Eingangskanal für ein Neutralleiterstrom-Eingangssignal umfasst.
EP08701267A 2007-01-05 2008-01-07 Mehrphasen-strommessgerät Active EP2104859B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007001221A DE102007001221B4 (de) 2007-01-05 2007-01-05 Mehrphasen-Elektroenergiezähler
US11/963,546 US7689374B2 (en) 2007-01-05 2007-12-21 Polyphase electric energy meter
PCT/EP2008/050088 WO2008081046A2 (en) 2007-01-05 2008-01-07 Polyphase electric energy meter

Publications (2)

Publication Number Publication Date
EP2104859A2 EP2104859A2 (de) 2009-09-30
EP2104859B1 true EP2104859B1 (de) 2010-06-09

Family

ID=39477692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08701267A Active EP2104859B1 (de) 2007-01-05 2008-01-07 Mehrphasen-strommessgerät

Country Status (5)

Country Link
US (2) US7689374B2 (de)
EP (1) EP2104859B1 (de)
AT (1) ATE470870T1 (de)
DE (2) DE102007001221B4 (de)
WO (1) WO2008081046A2 (de)

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DE102007001221B4 (de) * 2007-01-05 2011-09-22 Texas Instruments Deutschland Gmbh Mehrphasen-Elektroenergiezähler
JP2010147698A (ja) * 2008-12-17 2010-07-01 Toshiba Corp 信号処理回路及びこれを用いた受信機
US8235747B2 (en) * 2010-02-25 2012-08-07 Steven Bruce Fish Device and method of installing capacitors on a utility company's power meter
US9157940B2 (en) * 2011-02-09 2015-10-13 Smart Energy Instruments, Inc. Power measurement device
US9194897B2 (en) * 2011-03-10 2015-11-24 Samsung Electro-Mechanics Co., Ltd. Electronic watt-hour meter and electronic watt-hour measuring method
CN102565528B (zh) * 2012-03-13 2014-04-16 钜泉光电科技(上海)股份有限公司 电能表
CN103728492B (zh) * 2012-10-16 2016-09-14 苏州新宏博智能科技股份有限公司 多电压多电流回路交流电表
US9261544B2 (en) * 2013-04-12 2016-02-16 Landis+Gyr, Inc. VA metering in delta-wired electrical service
US9513319B1 (en) * 2014-11-25 2016-12-06 Cypress Semiconductor Corporation Systems, methods, and devices for energy and power metering
US10830801B2 (en) 2017-02-01 2020-11-10 Landis+Gyr Innovations, Inc. VA metering in delta-wired electrical service
FR3080457B1 (fr) * 2018-04-20 2020-10-23 Sagemcom Energy & Telecom Sas Compteur d'energie electrique comportant un circuit de mesure de courant et un circuit de mesure de tension
CN117749182A (zh) * 2022-09-14 2024-03-22 恩智浦美国有限公司 利用扩展复用器和辅助电路配置控制的模数转换器(adc)自动顺序扫描
JP7847520B2 (ja) * 2022-09-21 2026-04-17 アズビル株式会社 Ａｄ変換回路

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Also Published As

Publication number Publication date
DE102007001221A1 (de) 2008-07-10
US20100052962A1 (en) 2010-03-04
EP2104859A2 (de) 2009-09-30
DE602008001495D1 (de) 2010-07-22
US20080215262A1 (en) 2008-09-04
US7689374B2 (en) 2010-03-30
DE102007001221B4 (de) 2011-09-22
ATE470870T1 (de) 2010-06-15
WO2008081046A3 (en) 2008-10-30
WO2008081046A2 (en) 2008-07-10

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